{"id":4217,"date":"2025-06-01T11:36:05","date_gmt":"2025-06-05T04:24:05","guid":{"rendered":"https:\/\/badgameshow.com\/steven\/?p=4217"},"modified":"2025-06-05T11:36:05","modified_gmt":"2025-06-05T04:24:05","slug":"%e5%ad%b8%e7%bf%92swift%e4%b8%adoverridingdeclaration%e9%9c%80%e8%a6%81%e4%bd%bf%e7%94%a8override%e9%97%9c%e9%8d%b5%e5%ad%97-3","status":"publish","type":"post","link":"https:\/\/badgameshow.com\/steven\/swift\/%e5%ad%b8%e7%bf%92swift%e4%b8%adoverridingdeclaration%e9%9c%80%e8%a6%81%e4%bd%bf%e7%94%a8override%e9%97%9c%e9%8d%b5%e5%ad%97-3\/","title":{"rendered":"2025 \u6700\u65b0 Swift \u7a0b\u5f0f\u6559\u5b78\uff1a\u638c\u63e1 Overriding Declaration \u8207 &#8216;override&#8217; \u95dc\u9375\u5b57\u7684\u4f7f\u7528"},"content":{"rendered":"<p><meta name=\"keywords\" content=\"Swift, Overriding, Declaration, Keyword, Swift \u6559\u5b78, Swift \u7a0b\u5f0f\u8a2d\u8a08\"><\/p>\n<h1>2025 \u6700\u65b0 Swift \u7a0b\u5f0f\u6559\u5b78\uff1a\u638c\u63e1 Overriding Declaration \u8207 &#8216;override&#8217; \u95dc\u9375\u5b57\u7684\u4f7f\u7528<\/h1>\n<p>Swift \u662f\u4e00\u7a2e\u5f37\u5927\u4e14\u73fe\u4ee3\u7684\u7a0b\u5f0f\u8a9e\u8a00\uff0c\u64c1\u6709\u7c21\u6f54\u7684\u8a9e\u6cd5\u548c\u591a\u7a2e\u5148\u9032\u7684\u7279\u6027\u3002\u5176\u4e2d\uff0c<strong>Overriding Declaration<\/strong> \u662f\u4e00\u500b\u8b93\u958b\u767c\u8005\u80fd\u5920\u5728\u5b50\u985e\u5225\u4e2d\u91cd\u65b0\u5b9a\u7fa9\u7236\u985e\u5225\u7684\u65b9\u6cd5\u7684\u7279\u6027\u3002\u9019\u7bc7\u6587\u7ae0\u5c07\u6df1\u5165\u63a2\u8a0e\u5982\u4f55\u6b63\u78ba\u4f7f\u7528 <code>override<\/code> \u95dc\u9375\u5b57\uff0c\u4ee5\u907f\u514d\u5e38\u898b\u7684\u932f\u8aa4\u4e26\u63d0\u5347\u4f60\u7684\u7a0b\u5f0f\u8a2d\u8a08\u6280\u80fd\u3002<\/p>\n<h2>\u70ba\u4ec0\u9ebc\u8981\u4f7f\u7528 <code>override<\/code> \u95dc\u9375\u5b57\uff1f<\/h2>\n<p>\u4f7f\u7528 <code>override<\/code> \u95dc\u9375\u5b57\u7684\u4e3b\u8981\u539f\u56e0\u662f\u70ba\u4e86\u8b93\u958b\u767c\u8005\u548c\u7de8\u8b6f\u5668\u90fd\u80fd\u5920\u6e05\u695a\u5730\u77e5\u9053\u7576\u524d\u7684\u65b9\u6cd5\u662f\u5c0d\u7236\u985e\u5225\u7684\u65b9\u6cd5\u7684\u91cd\u5beb\uff0c\u800c\u975e\u65b0\u589e\u4e00\u500b\u65b9\u6cd5\u3002\u9019\u4e0d\u50c5\u6709\u52a9\u65bc\u63d0\u9ad8\u7a0b\u5f0f\u78bc\u7684\u53ef\u8b80\u6027\uff0c\u540c\u6642\u4e5f\u907f\u514d\u4e86\u56e0\u70ba\u4e0d\u5c0f\u5fc3\u91cd\u540d\u800c\u5c0e\u81f4\u7684\u908f\u8f2f\u932f\u8aa4\u3002<\/p>\n<h2>\u5982\u4f55\u4f7f\u7528 <code>override<\/code> \u95dc\u9375\u5b57\uff1f<\/h2>\n<p>\u4f7f\u7528 <code>override<\/code> \u95dc\u9375\u5b57\u975e\u5e38\u7c21\u55ae\u3002\u53ea\u9700\u5728\u5b50\u985e\u5225\u4e2d\u91cd\u65b0\u5b9a\u7fa9\u7236\u985e\u5225\u7684\u65b9\u6cd5\u6642\uff0c\u5728\u65b9\u6cd5\u524d\u52a0\u4e0a <code>override<\/code> \u95dc\u9375\u5b57\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u5be6\u4f5c\u7bc4\u4f8b\uff1a<\/p>\n<pre class=\"brush: swift\">\nclass Parent {\n    func sayHello() {\n        print(\"Hello\")\n    }\n}\n\nclass Child: Parent {\n    override func sayHello() {\n        print(\"Hi\")\n    }\n}\n<\/pre>\n<p>\u5728\u4e0a\u9762\u7684\u7a0b\u5f0f\u78bc\u4e2d\uff0c<code>Child<\/code> \u985e\u5225\u91cd\u5beb\u4e86\u7236\u985e\u5225 <code>Parent<\/code> \u7684 <code>sayHello()<\/code> \u65b9\u6cd5\u3002\u4f7f\u7528 <code>override<\/code> \u95dc\u9375\u5b57\u78ba\u4fdd\u7de8\u8b6f\u5668\u80fd\u5920\u6b63\u78ba\u8b58\u5225\u9019\u4e00\u9ede\uff0c\u907f\u514d\u51fa\u73fe\u932f\u8aa4\u63d0\u793a <strong>Overriding declaration requires an &#8216;override&#8217; keyword<\/strong>\u3002<\/p>\n<h2>\u932f\u8aa4\u6392\u9664\uff1a\u5e38\u898b\u554f\u984c\u53ca\u89e3\u6c7a\u65b9\u6cd5<\/h2>\n<p>\u5728\u4f7f\u7528 <code>override<\/code> 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\u7684\u57fa\u790e\u3002\u5b83\u4e0d\u50c5\u63d0\u9ad8\u4e86\u7a0b\u5f0f\u78bc\u7684\u53ef\u8b80\u6027\uff0c\u4e5f\u70ba\u958b\u767c\u8005\u63d0\u4f9b\u4e86\u66f4\u5b89\u5168\u7684\u908a\u754c\u3002\u5728\u958b\u767c\u904e\u7a0b\u4e2d\uff0c\u52d9\u5fc5\u6ce8\u610f\u4f7f\u7528\u6b64\u95dc\u9375\u5b57\uff0c\u4ee5\u907f\u514d\u4e0d\u5fc5\u8981\u7684\u932f\u8aa4\u3002<\/p>\n<h2>Q&#038;A\uff08\u5e38\u898b\u554f\u984c\u89e3\u7b54\uff09<\/h2>\n<h3>Q1: \u70ba\u4ec0\u9ebc\u6211\u7684\u91cd\u5beb\u65b9\u6cd5\u7121\u6cd5\u6b63\u5e38\u904b\u4f5c\uff1f<\/h3>\n<p>A1: \u78ba\u4fdd\u7236\u985e\u5225\u7684\u65b9\u6cd5\u5df2\u4f7f\u7528 <code>open<\/code> \u6216 <code>public<\/code> \u4fee\u98fe\u7b26\uff0c\u4e14\u5b50\u985e\u5225\u5728\u91cd\u5beb\u6642\u4f7f\u7528\u4e86 <code>override<\/code> \u95dc\u9375\u5b57\u3002<\/p>\n<h3>Q2: \u4ec0\u9ebc\u6642\u5019\u9700\u8981\u4f7f\u7528 <code>override<\/code> \u95dc\u9375\u5b57\uff1f<\/h3>\n<p>A2: 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